Ohm's law application: If a circuit has 12 V and 3 Ω, what is the current?

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Multiple Choice

Ohm's law application: If a circuit has 12 V and 3 Ω, what is the current?

Explanation:
Current is determined by how much voltage pushes through a given resistance. Ohm's law states I = V / R. With 12 volts across a 3-ohm resistor, the current is 12 ÷ 3 = 4 amperes. This makes sense because increasing voltage (with the same resistance) increases current, while increasing resistance (with the same voltage) decreases current. If you see 3 amperes, that would require a voltage of V = I × R = 3 A × 3 Ω = 9 V, not 12 V. For 6 amperes, you'd need 18 V, and for 9 amperes, 27 V. So 12 V and 3 Ω indeed give 4 A.

Current is determined by how much voltage pushes through a given resistance. Ohm's law states I = V / R. With 12 volts across a 3-ohm resistor, the current is 12 ÷ 3 = 4 amperes. This makes sense because increasing voltage (with the same resistance) increases current, while increasing resistance (with the same voltage) decreases current.

If you see 3 amperes, that would require a voltage of V = I × R = 3 A × 3 Ω = 9 V, not 12 V. For 6 amperes, you'd need 18 V, and for 9 amperes, 27 V. So 12 V and 3 Ω indeed give 4 A.

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